bug#24317: 25.1.50; image-dired-rotate-original: regexp doesn't match .jpeg suffix

[Eli Zaretskii]

> From: Thien-Thi Nguyen <ttn@gnu.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  24317@debbugs.gnu.org
> Date: Sat, 27 Aug 2016 11:42:31 +0200
> 
> Another idea is to use function ‘image-type’,
> which can handle a filename as its SOURCE argument.

That is better, yes.  Except that

  (let ((case-fold-search)) (image-type-from-file-name "foo.JPEG"))
    => nil

So I guess that function needs a minor change to be more robust.